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Yes, the PE layer is listed at 1/2 mil, but the specs actually have the total thickness at about 1/2". The real question is what the fabric layer is made of if it's going to contribute insulation value. I don't think you can really compare to IX, since the PE is a sheet and not foam. It's more like using a vapor barrier plastic sheet with a piece of fabric. I suppose it's still possible by layering it you could get some pretty good insulation, but if the total weight of each sheet is .6lb, that would add up fast. It's 4x10, so you could get two layers out of each sheet.

I may have posted too quickly. I think this is a dead end. Sorry. This stuff is nowhere near 1/2 in. in thickness. I dont have a scale so no actual weight data. I did get warm when wrapped in it, but I was fully clothed, in my house, on my couch, with my daughter laughing at me. I really really wanted it to work.

Like any good inquisitor, in order to better understand something I destroyed it. Upon closer inspection, this stuff is more like Saran wrap with lint glued to it. I tore 1/2 in. square piece off the edge and it stretched, and stretched, and stretched. Very very thin. Once tore apart, I'm willing to believe ths stuff is some kind of paper dust stuck to a micro film of pe.

Oh well. I really wanted it to be a great find. I'll try to post a pic or video of my observation and destruction.